You're not going to walk away with an in-depth knowledge of how to build your own digital camera from watching this video. But Canon's behind-the-scenes peek at what goes into building and designing its digital cameras and lenses is still pretty fascinating.
As PetaPixel points out, the most fascinating tidbit is just how precisely the camera's lenses are crafted and polished. If you were to enlarge one to the size of a domed stadium, the "margin of error would be less than the thickness of a business card". That's impressive. [YouTube via PetaPixel]